Astronomy:List of smallest galaxies

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M60-UCD1 is one of the smallest and densest known galaxies.

Below is a list of the smallest known galaxies ordered by their diameters. Every galaxy on this list is below 20,000 light-years and they are sorted in sorted in ascending order.

List

This list is incomplete; you can help by expanding it.
List of smallest known galaxies
Name Diameter (light-years) Notes
Ursa Major III 9.6[1] Could be a star cluster instead of a galaxy.
M85-HCC1 12.06 ± 5.87[2] Could be a star cluster instead of a galaxy.
M60-UCD1 158 ± 3.26[3] Potential smallest known non-disputed galaxy.
Andromeda XVIII 650 ± 48[4]
Ursa Minor Dwarf 2739.7[5]
GN-z11 4,000 ± 2,000[6]
UGC 11411 ~5,600[7]
UGC 6541 ~5,700[8]
Messier 32 8,000[9]
Sextans A ~8,000[10]
NGC 4118 ~8,100[11]
Sextans B ~8,900[12]
NGC 6822 ~9,200[13]
Messier 110 17,050[14]
Small Magellanic Cloud 18,900[15]

References

  1. ↑ Devlin, Scot; Baumgardt, Holger; Sweet, Sarah M. (2025-05-01), "Reevaluating UMa3/U1: star cluster or the smallest known galaxy?", Monthly Notices of the Royal Astronomical Society 539 (3): 2485, doi:10.1093/mnras/staf572, Bibcode: 2025MNRAS.539.2485D, http://arxiv.org/abs/2504.21301, retrieved 2025-12-14 
  2. ↑ Michael A. Sandoval; Richard P. Vo; Aaron J. Romanowsky (2015). "Hiding in plain sight: record-breaking compact stellar systems in the Sloan Digital Sky Survey". Astrophysical Journal Letters 808 (1): L32. doi:10.1088/2041-8205/808/1/l32. Bibcode: 2015ApJ...808L..32S. 
  3. ↑ Strader, Jay; Seth, Anil; Forbes, Duncan; Fabbiano, Giuseppina; Romanowsky, Aaron; Brodie, Jean; Conroy, Charlie; Caldwell, Nelson et al. (2013-08-14), "The Densest Galaxy", The Astrophysical Journal 775 (1): L6, doi:10.1088/2041-8205/775/1/L6, Bibcode: 2013ApJ...775L...6S 
  4. ↑ Collins, Michelle L. M.; Chapman, Scott C.; Rich, R. Michael; Ibata, Rodrigo A.; Martin, Nicolas F.; Irwin, Michael J.; Bate, Nicholas F.; Lewis, Geraint F. et al. (2013-02-26), "A Kinematic Study of the Andromeda Dwarf Spheroidal System", The Astrophysical Journal 768 (2): 172, doi:10.1088/0004-637X/768/2/172, Bibcode: 2013ApJ...768..172C 
  5. ↑ "By Name | NASA/IPAC Extragalactic Database". https://ned.ipac.caltech.edu/byname?objname=Ursa+Minor+Dwarf&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  6. ↑ Oesch, P. A.; Brammer, G.; Dokkum, P. G. van; Illingworth, G. D.; Bouwens, R. J.; Labbe, I.; Franx, M.; Momcheva, I. et al. (2016-03-01), "A Remarkably Luminous Galaxy at Z = 11.1 Measured with Hubble Space Telescope Grism Spectroscopy", The Astrophysical Journal 819 (2): 129, doi:10.3847/0004-637X/819/2/129, Bibcode: 2016ApJ...819..129O, http://arxiv.org/abs/1603.00461, retrieved 2025-12-14 
  7. ↑ "By Name | NASA/IPAC Extragalactic Database". https://ned.ipac.caltech.edu/byname?objname=UGC+11411&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  8. ↑ "By Name | NASA/IPAC Extragalactic Database". https://ned.ipac.caltech.edu/byname?objname=UGC+06541&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  9. ↑ "By Name | NASA/IPAC Extragalactic Database". https://ned.ipac.caltech.edu/byname?objname=m+32&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  10. ↑ "By Name | NASA/IPAC Extragalactic Database". https://ned.ipac.caltech.edu/byname?objname=Sextans+A&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  11. ↑ "By Name | NASA/IPAC Extragalactic Database". https://ned.ipac.caltech.edu/byname?objname=NGC+4118&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1https://ned.ipac.caltech.edu/byname?objname=NGC+4118&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  12. ↑ "By Name | NASA/IPAC Extragalactic Database". https://ned.ipac.caltech.edu/byname?objname=Sextans+B&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  13. ↑ "By Name | NASA/IPAC Extragalactic Database". https://ned.ipac.caltech.edu/byname?objname=NGC+6822&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  14. ↑ "By Name | NASA/IPAC Extragalactic Database". https://ned.ipac.caltech.edu/byname?objname=M+110&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  15. ↑ "By Name | NASA/IPAC Extragalactic Database". https://ned.ipac.caltech.edu/byname?objname=SMC&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 



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